Improved production and in situ recovery of sesquiterpene (+)-zizaene from metabolically-engineered E. Coli

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Aguilar, F.; Scheper, T.; Beutel, S.: Improved production and in situ recovery of sesquiterpene (+)-zizaene from metabolically-engineered E. Coli. In: Molecules 24 (2019), Nr. 18, 3356. DOI: https://doi.org/10.3390/molecules24183356

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The sesquiterpene (+)-zizaene is the direct precursor of khusimol, the main fragrant compound of the vetiver essential oil from Chrysopogon zizanioides and used in nearly 20% of men’s fine perfumery. The biotechnological production of such fragrant sesquiterpenes is a promising alternative towards sustainability; nevertheless, product recovery from fermentation is one of the main constraints. In an effort to improve the (+)-zizaene recovery from a metabolically-engineered Escherichia coli, we developed an integrated bioprocess by coupling fermentation and (+)-zizaene recovery using adsorber extractants. Initially, (+)-zizaene volatilization was confirmed from cultivations with no extractants but application of liquid–liquid phase partitioning cultivation (LLPPC) improved (+)-zizaene recovery nearly 4-fold. Furthermore, solid–liquid phase partitioning cultivation (SLPPC) was evaluated by screening polymeric adsorbers, where Diaion HP20 reached the highest recovery. Bioprocess was scaled up to 2 L bioreactors and in situ recovery configurations integrated to fermentation were evaluated. External recovery configuration was performed with an expanded bed adsorption column and improved (+)-zizaene titers 2.5-fold higher than LLPPC. Moreover, internal recovery configuration (IRC) further enhanced the (+)-zizaene titers 2.2-fold, whereas adsorption velocity was determined as critical parameter for recovery efficiency. Consequently, IRC improved the (+)-zizaene titer 8.4-fold and productivity 3-fold from our last report, achieving a (+)-zizaene titer of 211.13 mg L−1 and productivity of 3.2 mg L−1 h−1. This study provides further knowledge for integration of terpene bioprocesses by in situ product recovery, which could be applied for many terpene studies towards the industrialization of fragrant molecules.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2019
Appears in Collections:Naturwissenschaftliche Fakultät

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pos. country downloads
total perc.
1 image of flag of Germany Germany 91 61.49%
2 image of flag of United States United States 35 23.65%
3 image of flag of China China 8 5.41%
4 image of flag of Netherlands Netherlands 2 1.35%
5 image of flag of Japan Japan 2 1.35%
6 image of flag of Indonesia Indonesia 2 1.35%
7 image of flag of France France 2 1.35%
8 image of flag of India India 1 0.68%
9 image of flag of Bangladesh Bangladesh 1 0.68%
10 image of flag of Austria Austria 1 0.68%
    other countries 3 2.03%

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